Densification and lithium ion conductivity of garnet-type Li7-xLa3Zr2-xTaxO12 (x=0.25) solid electrolytes

doi:10.1088/1674-1056/22/7/078201

中国物理B ›› 2013, Vol. 22 ›› Issue (7): 78201-078201.doi: 10.1088/1674-1056/22/7/078201

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Densification and lithium ion conductivity of garnet-type Li_7-xLa₃Zr_2-xTa_xO₁₂ (x=0.25) solid electrolytes

曹阳, 李忆秋, 郭向欣

State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

收稿日期:2013-01-04 修回日期:2013-01-22 出版日期:2013-06-01 发布日期:2013-06-01

Densification and lithium ion conductivity of garnet-type Li_7-xLa₃Zr_2-xTa_xO₁₂ (x=0.25) solid electrolytes

Cao Yang (曹阳), Li Yi-Qiu (李忆秋), Guo Xiang-Xin (郭向欣)

State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Received:2013-01-04 Revised:2013-01-22 Online:2013-06-01 Published:2013-06-01
Contact: Guo Xiang-Xin E-mail:XXGuo@mail.sic.ac.cn

摘要/Abstract

摘要： The garnet-type Li₇La₃Zr₂O₁₂ ceramic is one of promising solid electrolytes for all-solid-state secondary lithium batteries. However, it faces problem of volatilization of lithium during sintering, which may cause low density and deterioration of ionic conductivity. In this work, the effects of sintering temperature and addition on the density as well as the lithium ion conductivity of Li_7-xLa₃Zr_2-xTa_xO₁₂ (LLZTO, x=0.25) ceramics prepared by solid state reaction have been studied. It is found that optimization of the sintering temperature leads to a minor increase in the ceramic density, yielding an optimum ionic conductivity of 2.9×10^-4 S·cm^-1 at 25℃. Introduction of Li₃PO₄ addition in an appropriate concentration can obviously increase the density, leading to an optimum ionic conductivity of 7.2×10^-4 S·cm^-1 at 25℃. This value is superior to the conductivity data in most recent reports on the LLZTO ceramics.

关键词: garnet electrolyte, sintering temperature, sintering addition, ionic conductivity

Abstract: The garnet-type Li₇La₃Zr₂O₁₂ ceramic is one of promising solid electrolytes for all-solid-state secondary lithium batteries. However, it faces problem of volatilization of lithium during sintering, which may cause low density and deterioration of ionic conductivity. In this work, the effects of sintering temperature and addition on the density as well as the lithium ion conductivity of Li_7-xLa₃Zr_2-xTa_xO₁₂ (LLZTO, x=0.25) ceramics prepared by solid state reaction have been studied. It is found that optimization of the sintering temperature leads to a minor increase in the ceramic density, yielding an optimum ionic conductivity of 2.9×10^-4 S·cm^-1 at 25℃. Introduction of Li₃PO₄ addition in an appropriate concentration can obviously increase the density, leading to an optimum ionic conductivity of 7.2×10^-4 S·cm^-1 at 25℃. This value is superior to the conductivity data in most recent reports on the LLZTO ceramics.

Key words: garnet electrolyte, sintering temperature, sintering addition, ionic conductivity

中图分类号: (Lithium-ion batteries)

82.47.Aa

66.10.Ed (Ionic conduction) 81.20.-n (Methods of materials synthesis and materials processing)

曹阳, 李忆秋, 郭向欣. Densification and lithium ion conductivity of garnet-type Li_7-xLa₃Zr_2-xTa_xO₁₂ (x=0.25) solid electrolytes[J]. 中国物理B, 2013, 22(7): 78201-078201.

Cao Yang (曹阳), Li Yi-Qiu (李忆秋), Guo Xiang-Xin (郭向欣). Densification and lithium ion conductivity of garnet-type Li_7-xLa₃Zr_2-xTa_xO₁₂ (x=0.25) solid electrolytes[J]. Chin. Phys. B, 2013, 22(7): 78201-078201.

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Densification and lithium ion conductivity of garnet-type Li_7-xLa₃Zr_2-xTa_xO₁₂ (x=0.25) solid electrolytes

Densification and lithium ion conductivity of garnet-type Li_7-xLa₃Zr_2-xTa_xO₁₂ (x=0.25) solid electrolytes

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